diff --git a/chat.php b/chat.php
index 3521136..3599c12 100644
--- a/chat.php
+++ b/chat.php
@@ -3424,6 +3424,7 @@ function cron(){
 	if(get_setting('nextcron')>$time){
 		return;
 	}
+	update_setting('nextcron', $time+10);
 	// delete old sessions
 	$stmt=$db->prepare('DELETE FROM ' . PREFIX . 'sessions WHERE (status<=2 AND lastpost<(?-60*(SELECT value FROM ' . PREFIX . "settings WHERE setting='guestexpire'))) OR (status>2 AND lastpost<(?-60*(SELECT value FROM " . PREFIX . "settings WHERE setting='memberexpire')));");
 	$stmt->execute([$time, $time]);
@@ -3437,9 +3438,17 @@ function cron(){
 	$stmt=$db->prepare('DELETE FROM ' . PREFIX . 'messages WHERE id IN (SELECT * FROM (SELECT id FROM ' . PREFIX . 'messages WHERE postdate<(?-60*(SELECT value FROM ' . PREFIX . "settings WHERE setting='messageexpire'))) AS t);");
 	$stmt->execute([$time]);
 	// delete expired ignored people
-	$db->exec('DELETE FROM ' . PREFIX . 'ignored WHERE ign NOT IN (SELECT nickname FROM ' . PREFIX . 'sessions UNION SELECT nickname FROM ' . PREFIX . 'members UNION SELECT poster FROM ' . PREFIX . 'messages) OR ignby NOT IN (SELECT nickname FROM ' . PREFIX . 'sessions UNION SELECT nickname FROM ' . PREFIX . 'members UNION SELECT poster FROM ' . PREFIX . 'messages);');
+	$result=$db->query('SELECT id FROM ' . PREFIX . 'ignored WHERE ign NOT IN (SELECT nickname FROM ' . PREFIX . 'sessions UNION SELECT nickname FROM ' . PREFIX . 'members UNION SELECT poster FROM ' . PREFIX . 'messages) OR ignby NOT IN (SELECT nickname FROM ' . PREFIX . 'sessions UNION SELECT nickname FROM ' . PREFIX . 'members UNION SELECT poster FROM ' . PREFIX . 'messages);');
+	$stmt=$db->prepare('DELETE FROM ' . PREFIX . 'ignored WHERE id=?;');
+	while($tmp=$result->fetch(PDO::FETCH_NUM)){
+		$stmt->execute($tmp);
+	}
 	// delete files that do not belong to any message
-	$db->exec('DELETE FROM ' . PREFIX . 'files WHERE postid NOT IN (SELECT id FROM ' . PREFIX . 'messages UNION SELECT postid FROM ' . PREFIX . 'inbox);');
+	$result=$db->query('SELECT id FROM ' . PREFIX . 'files WHERE postid NOT IN (SELECT id FROM ' . PREFIX . 'messages UNION SELECT postid FROM ' . PREFIX . 'inbox);');
+	$stmt=$db->prepare('DELETE FROM ' . PREFIX . 'files WHERE id=?;');
+	while($tmp=$result->fetch(PDO::FETCH_NUM)){
+		$stmt->execute($tmp);
+	}
 	// delete old notes
 	$limit=get_setting('numnotes');
 	$db->exec('DELETE FROM ' . PREFIX . 'notes WHERE type!=2 AND id NOT IN (SELECT * FROM ( (SELECT id FROM ' . PREFIX . "notes WHERE type=0 ORDER BY id DESC LIMIT $limit) UNION (SELECT id FROM " . PREFIX . "notes WHERE type=1 ORDER BY id DESC LIMIT $limit) ) AS t);");
@@ -3448,7 +3457,6 @@ function cron(){
 	while($tmp=$result->fetch(PDO::FETCH_NUM)){
 		$stmt->execute([$tmp[0], $tmp[0]]);
 	}
-	update_setting('nextcron', $time+10);
 }
 
 function destroy_chat($C){